No, I haven’t. But I will try it now. Thanks!
read the infos, you’ll need to install libfredo6 aswell, and check the videos (ok maybe not all), Fredo’s plugins are popular and come with either detailed operation manual or multiple videos.
Depending on the detail level you put in your piece, you might have to make it bigger (like, scale 10), round stuff up, then make it smaller (scale 0,1), because this extension is not immune to the small faces limit of SU.
Okay, thanks. To get around the limit I usually create a circle with the radius I need and then chop out a corner to use as my Follow Me arc. That works most of the time but sometimes SU says nope.
Follow Me works best when the profile to be extruded is perpendicular to the first segment of the path. Usually SketchUp will warn you when this is not the case and ask if you want to perform the Follow Me operation anyway (in which case SketchUp will project the profile onto a plane perpendicular to the first path segment, then use that projected profile which results in some level of shape distortion). Your description of using a portion of a circular arc makes me wonder if the above perpendicularity factor is involved.
Consider a “circle” with 16 segments, with every fourth vertex aligned along axes. None of the edges forming the circle will be parallel or perpendicular to the axes. Let’s say you keep 90 degrees of the circle (four adjacent edges) as the path and delete the remainder. If the profile is drawn along an axis plane, the projection issue described above will occur because the profile would not be perpendicular to the first segment.
Not sure what the issue is, but you may be correct! Only once have I been able to successfully apply the fillet via FM and of course I ended up with those shattered hemispheres on intersections because the radius is too small. I could have spent hours manually repairing them, but in the end I opted for a chamfer. It’s not accurate so far as this replica vehicle goes, but sacrifices must be made!
I often do that on small pieces. Yeah sure it’s supposed to be rounded, but hey, we’re talking about less than a milimeter, I’ll see it from a few meters away, a chamfer is fine. it’s all about visually breaking the angle, once you remove the edges (manually or render), and zoom out to see the whole project, it’s fine.
True. Plus the end connectors will mostly be either buried in sand or hidden behind the side skirts, so I think we’ll get away with this small deceit. 
I’m still learning V-Ray, but I believe it has a tool to render sharp edges with a softened edge without actually rounding it off in SketchUp. That won’t show in the SketchUp view but will in the V-Ray rendering. Also IIRC, @Box had a trick for faking a rounded edge by offsetting the profile back a bit from the edge and then softening the edge itself.
What @RTCool is referring to is using a couple of offsets and shift with the eraser to limit the distortion created by a softened edge.
If you just use ctrl eraser on some edges it will make your faces ugly but by using shift eraser on the other edges the distortion is contained within the lines and the edge looks rounded, without adding lots of geometry.
You should also look at The Dave Method, very useful for small details to parts of models.
That looks just like a lifesaver winter mint. 
You can also use V-Ray’s Bump attributes to modify edges based on color/textures. It only mods the rendered image, not the actual drawing. It’s pretty useful and works well, but I’m really hoping to de-edgify the drawing itself.
You could try the “Dave method” to avoid the tiny edge problem…
These extensions are very handy for this but for your information, these are both paid extensions.
I believe there is a trial period though!
yep, they have a price, and 15 days trial
Also has the advantage of easier to dimension (no multiple snapping points ) and no multiple lines if wanting conventional cad line output
The past week has been a bear with construction issues and not a lot of drawing has happened, but at least the track is finally complete. (“Now With Added Center Guides!”)
You can see there is a lot of de-edgification that hasn’t been done, and I’m probably not going to do it. Or maybe later. We’ll see.
PS – the end connectors are on backwards/upside down/inside out. The hard to see downward facing nut is supposed to be on the upwards facing side.
If you are dealing with components (which I hope and assume) doing so won’t be too bad.
I build the tracks up from the one master track link. so I only really have to mod that. Maybe I ought to bite the bullet and get it done.
Smut! 
This is what the turret of an M1A2 Abrams looks like when stripped of absolutely everything that isn’t welded on.
It’s still missing most of the cosmetic (ie non structural) weld beads, but was freshly painted anyway. The actual color is much darker than it appears to be in this image: I had to ramp up the contrast and brightness in Photoshop just to bring out the details against the overheads and the nuked background.
It’s been years since I built a tank model, but I follow a group for it on Facebook and track links seem to be the greatest source of cursing.